﻿/// <reference path="jquery.js" />
/*
ServiceProxy.js  
Version 0.964 - 9/15/09

(c) 2008-2009 Rick Strahl, West Wind Technologies 
www.west-wind.com

Licensed under MIT License
http://en.wikipedia.org/wiki/MIT_License
*/
this.ServiceProxy = function(serviceUrl) {
    /// <summary>
    /// Generic Service Proxy class that can be used to
    /// call JSON Services generically using jQuery
    /// depends on JSON2.js modified for MS Ajax usage
    /// </summary>
    /// <param name="serviceUrl" type="string">
    /// The Url of the service ready to accept the method name
    /// should contain trailing slash (or other URL separator ?,&)
    /// </param>
    /// <example>
    /// var proxy = new ServiceProxy("JsonStockService.svc/");
    /// proxy.invoke("GetStockQuote",{symbol:"msft"},
    ///              function(quote) { alert(result.LastPrice); },onPageError);
    ///</example>

    var _I = this;
    this.serviceUrl = serviceUrl;
    this.isWcf = true;

    this.invoke = function(method, params, callback, errorHandler, bare) {
        /// <summary>
        /// Calls a WCF/ASMX service and returns the result.
        /// </summary>    
        /// <param name="method" type="string">The method of the service to call</param>
        /// <param name="params" type="object">An object that represents the parameters to pass {symbol:"msft",years:2}       
        /// <param name="callback" type="function">Function called on success. 
        /// Receives a single parameter of the parsed result value</parm>
        /// <param name="errorCallback" type="function">Function called on failure. 
        /// Receives a single error object with Message property</parm>
        /// <param name="isBare" type="boolean">Set to true if response is not a WCF/ASMX style 'wrapped' object</parm>

        var json = _I.isWcf ? JSON.stringifyWcf(params) : JSON.stringify(params);

        // Service endpoint URL        
        var url = _I.serviceUrl + method;

        $.ajax({
            url: url,
            data: json,
            type: "POST",
            processData: false,
            contentType: "application/json",
            timeout: 10000,
            dataType: "text",  // not "json" we'll parse
            success: function(res) {
                if (!callback) return;

                // Use json library so we can fix up MS AJAX dates
                var result = JSON.parseWithDate(res);

                // Bare message IS result
                if (bare)
                { callback(result); return; }

                // Wrapped message contains top level object node
                // strip it off
                for (var property in result) {
                    callback(result[property]);
                    break;
                }
            },
            error: function(xhr, status) {                
                var err = null;
                if (xhr.readyState == 4) {
                    var res = xhr.responseText;
                    if (res && res.charAt(0) == '{')
                        var err = JSON.parseWithDate(res);
                    if (!err) {
                        if (xhr.status && xhr.status != 200)
                            err = new CallbackException(xhr.status + " " + xhr.statusText);
                        else
                            err = new CallbackException("Callback Error: " + status);
                        err.detail = res;
                    }
                }
                //if (!err)
                //    err = new CallbackException("Callback Error: " + status);

                if (errorHandler)
                    errorHandler(status, _I, xhr);

            }
        });
    }
}


/*
http://www.JSON.org/json2.js
2009-04-16
Public Domain.
*/
if (!this.JSON) { this.JSON = {}; }
(function() {
    function f(n) { return n < 10 ? '0' + n : n; }
    if (typeof Date.prototype.toJSON !== 'function') {
        Date.prototype.toJSON = function(key) {
            return isFinite(this.valueOf()) ? this.getUTCFullYear() + '-' +
                    f(this.getUTCMonth() + 1) + '-' +
                    f(this.getUTCDate()) + 'T' +
                    f(this.getUTCHours()) + ':' +
                    f(this.getUTCMinutes()) + ':' +
                    f(this.getUTCSeconds()) + 'Z' : null;
        }; String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON = function(key) { return this.valueOf(); };
    }
    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, gap, indent, meta = { '\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f', '\r': '\\r', '"': '\\"', '\\': '\\\\' }, rep; function quote(string) { escapable.lastIndex = 0; return escapable.test(string) ? '"' + string.replace(escapable, function(a) { var c = meta[a]; return typeof c === 'string' ? c : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); }) + '"' : '"' + string + '"'; }
    function str(key, holder) {
        var i, k, v, length, mind = gap, partial, value = holder[key]; if (value && typeof value === 'object' && typeof value.toJSON === 'function') { value = value.toJSON(key); }
        if (typeof rep === 'function') { value = rep.call(holder, key, value); }
        switch (typeof value) {
            case 'string': return quote(value); case 'number': return isFinite(value) ? String(value) : 'null'; case 'boolean': case 'null': return String(value); case 'object': if (!value) { return 'null'; }
                gap += indent; partial = []; if (Object.prototype.toString.apply(value) === '[object Array]') {
                    length = value.length; for (i = 0; i < length; i += 1) { partial[i] = str(i, value) || 'null'; }
                    v = partial.length === 0 ? '[]' : gap ? '[\n' + gap +
partial.join(',\n' + gap) + '\n' +
mind + ']' : '[' + partial.join(',') + ']'; gap = mind; return v;
                }
                if (rep && typeof rep === 'object') { length = rep.length; for (i = 0; i < length; i += 1) { k = rep[i]; if (typeof k === 'string') { v = str(k, value); if (v) { partial.push(quote(k) + (gap ? ': ' : ':') + v); } } } } else { for (k in value) { if (Object.hasOwnProperty.call(value, k)) { v = str(k, value); if (v) { partial.push(quote(k) + (gap ? ': ' : ':') + v); } } } }
                v = partial.length === 0 ? '{}' : gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
mind + '}' : '{' + partial.join(',') + '}'; gap = mind; return v;
        } 
    }
    if (typeof JSON.stringify !== 'function') {
        JSON.stringify = function(value, replacer, space) {
            var i; gap = ''; indent = ''; if (typeof space === 'number') { for (i = 0; i < space; i += 1) { indent += ' '; } } else if (typeof space === 'string') { indent = space; }
            rep = replacer; if (replacer && typeof replacer !== 'function' && (typeof replacer !== 'object' || typeof replacer.length !== 'number')) { throw new Error('JSON.stringify'); }
            return str('', { '': value });
        };
    }
    if (typeof JSON.parse !== 'function') {
        JSON.parse = function(text, reviver) {
            var j; function walk(holder, key) {
                var k, v, value = holder[key]; if (value && typeof value === 'object') { for (k in value) { if (Object.hasOwnProperty.call(value, k)) { v = walk(value, k); if (v !== undefined) { value[k] = v; } else { delete value[k]; } } } }
                return reviver.call(holder, key, value);
            }
            cx.lastIndex = 0; if (cx.test(text)) {
                text = text.replace(cx, function(a) {
                    return '\\u' +
('0000' + a.charCodeAt(0).toString(16)).slice(-4);
                });
            }
            if (/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { j = eval('(' + text + ')'); return typeof reviver === 'function' ? walk({ '': j }, '') : j; }
            throw new SyntaxError('JSON.parse');
        };
    } 
} ());


if (this.JSON && !this.JSON.parseWithDate) {
    var reISO = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/;
    var reMsAjax = /^\/Date\((d|-|.*)\)[\/|\\]$/;
    // original var reMsAjax = /^\/Date\((d|-|.*)\)\/$/;

    JSON.parseWithDate = function(json) {
        /// <summary>
        /// parses a JSON string and turns ISO or MSAJAX date strings
        /// into native JS date objects
        /// </summary>    
        /// <param name="json" type="var">json with dates to parse</param>        
        /// </param>
        /// <returns type="value, array or object" />
        try {
            var res = JSON.parse(json,
            function(key, value) {
                if (typeof value === 'string') {
                    var a = reISO.exec(value);
                    if (a)
                        return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]));
                    a = reMsAjax.exec(value);
                    if (a) {
                        var b = a[1].split(/[-+,.]/);
                        return new Date(b[0] ? +b[0] : 0 - +b[1]);
                    }
                }
                return value;
            });
            return res;
        } catch (e) {
            // orignal error thrown has no error message so rethrow with message
            throw new Error("JSON content could not be parsed");
            return null;
        }
    };
    JSON.stringifyWcf = function(json) {
        /// <summary>
        /// Wcf specific stringify that encodes dates in the
        /// a WCF compatible format ("/Date(9991231231)/")
        /// Note: this format works ONLY with WCF. 
        ///       ASMX can use ISO dates as of .NET 3.5 SP1
        /// </summary>
        /// <param name="key" type="var">property name</param>
        /// <param name="value" type="var">value of the property</param>         
        return JSON.stringify(json, function(key, value) {
            if (typeof value == "string") {
                var a = reISO.exec(value);
                if (a) {                    
                    var val = '/Date(' + new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6])).getTime() + ')/';
                    this[key] = val;
                    return val;
                }
            }
            return value;
        })
    };
    JSON.dateStringToDate = function(dtString) {
        /// <summary>
        /// Converts a JSON ISO or MSAJAX string into a date object
        /// </summary>    
        /// <param name="" type="var">Date String</param>
        /// <returns type="date or null if invalid" /> 
        var a = reISO.exec(dtString);
        if (a)
            return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]));
        a = reMsAjax.exec(dtString);
        if (a) {
            var b = a[1].split(/[-,.]/);
            return new Date(+b[0]);
        }
        return null;
    };
}